#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>

int main()
{
	pid_t pid;

	printf("Before : pid is %d\n",getpid());
	
	pid = fork();
	if(pid == -1)
	{
		perror("fork()");
		exit(1);
	}

	printf("After : pid is %d , fork return %d\n",getpid(),pid);

	sleep(1);

	return 0;
}
